Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66e60e0e0d85c85…

MALICIOUS

PDF

95.2 KB Created: 2021-05-28 22:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e0a7a1cb0aad7b4d6fd47851aa5f7c0c SHA-1: cd5fb4ae3f7739af748ff43d72e988cbad7e0f00 SHA-256: e66e60e0e0d85c851468c824648ebc78d64b6c5442331bcbc8596728899e8e4f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The primary malicious URL identified is https://jumiwimov.ru/123, which is likely used to distribute further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jumiwimov.ru/123?utm_term=ultrasound+guided+cervical+plexus+block+video PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461498/normal_60306b2f7954c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380078/normal_601735626d656.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403260/normal_605f7e6cba2fa.pdfIn PDF document text
    • https://lufuroxula.weebly.com/uploads/1/3/1/4/131408913/2395dbb9abedf.pdfIn PDF document text
    • https://wupibivuvofat.weebly.com/uploads/1/3/1/1/131164023/e941936d4f5f.pdfIn PDF document text
    • https://kivobuduzuv.weebly.com/uploads/1/3/0/7/130739084/a99bc8d5acad.pdfIn PDF document text
    • https://lapenemelibi.weebly.com/uploads/1/3/4/7/134708636/deputa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418566/normal_5fd653515b522.pdfIn PDF document text
    • https://betepojikimiji.weebly.com/uploads/1/3/0/8/130874485/b417ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486033/normal_5ffd598279a20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404122/normal_604b716734b0e.pdfIn PDF document text
    • https://ragurinibobuma.weebly.com/uploads/1/3/3/9/133986244/tibat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464730/normal_605207b2b019d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/75fb1e25-259e-4628-87e0-2a73ea4fadf6/ib_exam_timetable_2020_november.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1864900f-2443-4215-8d55-9460b57a9304/bogapezavasobu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24ff8f39-7e82-4409-87f0-2ea05ed4f682/13851336982.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a76132ee-a526-4b4b-b376-fac9c7eef704/83468384316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c4c188f-87e1-48e0-ad14-a7384b6f13b2/how_to_deposit_money_into_skylight_account.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0981164f-c2bf-47b8-9043-1121b4d03067/j_kg_k_to_j_mol_k.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ec54ba4-2a17-429f-ad00-82140ce938d2/31691568145.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afde8e1d-8237-4cbc-bddd-a07ac7107e93/hams_test_procedure.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA7 5564 bytes
SHA-256: 7b2468a3fdbd0248cc4cd5b0398d4aabbcd7543f6c04ef0a1499a9f035be0c2b
font_01_sfnt_off000132b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B2 10844 bytes
SHA-256: 0df972f34af9aeb666b2b4d941485da05689aadbc219cf86e4dd37916fb9e9b4
font_02_sfnt_off00015833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15833 16148 bytes
SHA-256: aabbb95e4258a1bccfe6759090a0a8b97a33e8154131110566ffb2eaa8fdb080

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